The two leaders in a phone call "agreed to lift the cap on missile payload of South Korea as an effective countermeasure" against Pyongyang's test on Sunday of what it described as a hydrogen bomb designed for a long-range missile, the presidential office said in a statement.
Seoul was perviously restricted to a maximum warhead weight of 500 kilogrammes (1100 pounds) on its ballistic missiles, according to a bilateral agreement with the United States.
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